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The world's best gem articles, published weekly.

Most Recent Articles

Marketing and Selling Rare Gemstones

Looking to sell in the niche market of rare and collectible gemstones? A good strategy for marketing and selling rare gemstones will put you in touch with potential customers and pave the way for a successful business.

Chrysoprase Buying Guide

With bright, apple-green hues, chrysoprase makes an attractive, eye-catching jewelry stone. If you’re looking for a top-quality gem, read this guide before your chrysoprase buying trip to help you choose the best gem for your project.

An Introduction to Gemstone Inclusions

Gemstone inclusions are materials trapped inside gems as they form. Learn how gemologists use inclusions to help identify gemstones and their sources.

Amethyst Value, Price, and Jewelry Information

Amethyst is crystalline quartz in colors ranging from pale lilac to deep reddish purple. The February birthstone makes a fine, durable gemstone for all purposes, from jewelry to carved objects.

Yellow Gemstones (With 9 Gems Best for Rings!)

From bright, sunny colors to deep golden hues, yellow gemstones are warm and inviting. Learn how to assess the quality of yellow gems, and find out which ones won’t scratch or break in a ring.

Opal Mining in Coober Pedy: History and Methods

The town of Coober Pedy, Australia produces more opal than anywhere else. Its culture has been thoroughly shaped by opal mining. Learn more about this colorful location and the methods used to hunt for precious opals.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

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Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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